Capacitive Touch Display With Deformable Gap Electrodes
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Solution Overview
Problem
Existing display devices with touch and force sensing capabilities face challenges in accurately separating and detecting touch and force sensing signals due to shared sensor electrodes, leading to compromised accuracy in both touch and force sensing.
Innovation Solution
A display device configuration with a first electrode section and a second electrode section, separated by a deformable gap, allows for time-division-based signal detection using a circuit that applies distinct driving signals to each electrode section, enabling separate detection of touch and force sensing signals through changes in capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensor electrode is used for both touch sensing and force sensing, then the device structure is simplified, but the detection precision of both touch position and pressing force deteriorates due to signal interference
Solution Approach 1:
The sensor electrode is divided into two distinct electrode sections: a first electrode section for touch sensing and a second electrode section for force sensing. This segmentation allows each electrode to independently detect its specific signal without interference from the other, resolving the contradiction between structural simplicity and sensing accuracy.
Solution Approach 2:
A gap section is introduced as an intermediary element between the first and second electrode sections. This gap section is deformable in response to pressing forces, enabling the second electrode section to detect force through capacitance changes while maintaining electrical isolation from the first electrode section, thus preventing signal interference.
2Measurement precision
If separate electrode sections are used for touch sensing and force sensing, then the detection precision of both signals improves, but the device structure and circuit complexity increases
Solution Approach 1:
The circuit section integrates multiple sensing functions into a unified detection system. Both the first electrode section (touch sensing) and the second electrode section (force sensing) are connected to the same circuit section, which processes signals from both electrodes. This merging approach maintains high sensing accuracy while reducing overall system complexity compared to having completely separate detection circuits.
Solution Approach 2:
The circuit section is designed with multi-functionality to handle both touch sensing signals from the first electrode section and force sensing signals from the second electrode section. This universal circuit design eliminates the need for separate dedicated circuits for each sensing function, thereby improving precision without proportionally increasing device complexity.
3Speed
If simultaneous touch sensing and force sensing are performed using the same capacitance measurement, then the response time is reduced, but the reliability of individual sensing results deteriorates due to signal mixing
Solution Approach 1:
The sensor electrode is divided into two distinct electrode sections: a first electrode section for touch sensing and a second electrode section for force sensing. This segmentation allows each electrode to independently detect its specific signal without interference from the other, resolving the contradiction between structural simplicity and sensing accuracy.
Solution Approach 2:
A gap section is introduced as an intermediary element between the first and second electrode sections. This gap section is deformable in response to pressing forces, enabling the second electrode section to detect force through capacitance changes while maintaining electrical isolation from the first electrode section, thus preventing signal interference.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves the accuracy of both touch and force sensing by effectively isolating and detecting the respective signals, enhancing the precision of touch position coordinates and pressing force measurements.
Implementation Method 1
a capacitance value of a first capacitance between the first electrode section and the second electrode section is changeable due to deformation of the gap section
Implementation Method 2
the force sensing device detects a change amount of capacitance based on elastic deformation by press
Implementation Method 3
the force sensing device detects a change amount of capacitance based on elastic deformation by press, and calculates the pressing force based on the change amount
Implementation Method 4
a capacitance touch sensing device senses proximity and contact of an object such as a finger serving as a dielectric body to a screen based on a change in capacitance
Data Source
AI summary
A display device includes: a display section having a screen and a first electrode section provided at a first position in a thickness direction; a second electrode section provided at a second position in the thickness direction; a gap section which is provided between the first electrode section and the second electrode section and is deformable in the thickness direction when the screen is pressed; and a circuit section which is connected to the first electrode section and the second electrode section, displays to the screen, and detects a press onto the screen, and a capacitance value of a first capacitance between the first electrode section and the second electrode section is changeable due to deformation of the gap section. In a force period, the circuit section applies a sensor driving signal to the second electrode section, and detects a sensor detection signal based on the sensor driving signal through the first capacitance.